Commit 50e1092b authored by James Lentini's avatar James Lentini Committed by Trond Myklebust

SUNRPC xprtrdma: fix XDR tail buf marshalling for all ops

rpcrdma_convert_iovs is passed an xdr_buf representing either an RPC
request or an RPC reply. In the case of a request, several
calculations and tests involving pos are unnecessary. In the case of a
reply, several calculations and tests involving pos are incorrect (the
code tests pos against the reply xdr buf's len field, which is always
0 at the time rpcrdma_convert_iovs is executed). This change removes
the incorrect/unnecessary calculations and tests involving pos.

This fixes an observed problem when reading certain file sizes over
NFS/RDMA.
Signed-off-by: default avatarTom Tucker <tom@opengridcomputing.com>
Signed-off-by: default avatarTom Talpey <talpey@netapp.com>
Signed-off-by: default avatarJames Lentini <jlentini@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 5cef338b
......@@ -92,7 +92,6 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
seg[n].mr_page = NULL;
seg[n].mr_offset = xdrbuf->head[0].iov_base;
seg[n].mr_len = xdrbuf->head[0].iov_len;
pos += xdrbuf->head[0].iov_len;
++n;
}
......@@ -104,7 +103,6 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
seg[n].mr_len = min_t(u32,
PAGE_SIZE - xdrbuf->page_base, xdrbuf->page_len);
len = xdrbuf->page_len - seg[n].mr_len;
pos += len;
++n;
p = 1;
while (len > 0) {
......@@ -119,20 +117,15 @@ rpcrdma_convert_iovs(struct xdr_buf *xdrbuf, int pos,
}
}
if (pos < xdrbuf->len && xdrbuf->tail[0].iov_len) {
if (xdrbuf->tail[0].iov_len) {
if (n == nsegs)
return 0;
seg[n].mr_page = NULL;
seg[n].mr_offset = xdrbuf->tail[0].iov_base;
seg[n].mr_len = xdrbuf->tail[0].iov_len;
pos += xdrbuf->tail[0].iov_len;
++n;
}
if (pos < xdrbuf->len)
dprintk("RPC: %s: marshaled only %d of %d\n",
__func__, pos, xdrbuf->len);
return n;
}
......
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